public PositionView createPositionView(Portfolio portfolio, Integer instrumentId) {
Double lastPrice = mapStockPrices.get(instrumentId);
if (lastPrice == null) return null;
Position position = portfolio.getPosition(instrumentId);
return new PositionView(
portfolio.pmId,
instrumentId,
position.quantity,
lastPrice,
position.calculateProfitLoss(lastPrice));
}
